WO2023007295A1 - Électro-broche - Google Patents

Électro-broche Download PDF

Info

Publication number
WO2023007295A1
WO2023007295A1 PCT/IB2022/056486 IB2022056486W WO2023007295A1 WO 2023007295 A1 WO2023007295 A1 WO 2023007295A1 IB 2022056486 W IB2022056486 W IB 2022056486W WO 2023007295 A1 WO2023007295 A1 WO 2023007295A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrospindle
motor
joint
water
rotating element
Prior art date
Application number
PCT/IB2022/056486
Other languages
English (en)
Inventor
Marco POVOLO
Piero MOZZATO
Michele BRESSAN
Francesca SACCARDO
Original Assignee
Saccardo Gcf S.R.L. U.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saccardo Gcf S.R.L. U. filed Critical Saccardo Gcf S.R.L. U.
Priority to EP22747773.4A priority Critical patent/EP4323147A1/fr
Publication of WO2023007295A1 publication Critical patent/WO2023007295A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • B23Q11/1015—Arrangements for cooling or lubricating tools or work by supplying a cutting liquid through the spindle
    • B23Q11/103—Rotary joints specially adapted for feeding the cutting liquid to the spindle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means

Definitions

  • the present invention is applicable to the sector of industrial machining and, in particular, relates to a machine tool.
  • the present invention relates to an electrospindle for industrial machining.
  • the aforementioned power tools comprise electrospindles, i.e., motorized devices having a drive shaft provided with an end configured to retain radial and/or axial machining tools.
  • the electrospindles include a type where there is a pulling shaft arranged sliding inside the drive shaft.
  • the tool is fixed to the pulling shaft by means of a gripper.
  • the pulling shaft is movable inside the electrospindle according to its longitudinal extension axis so as to be able to be arranged according to a first retracted working configuration, in which the tool is retained and can therefore be moved, and a second resting configuration in which the pulling shaft is at least partially extracted, allowing the gripper to open, releasing the tool for its replacement or maintenance.
  • the known electrospindles often also comprise a joint stably coupled to the motor or to the pulling shaft and provided with a fitting for connection to a water supply pipe.
  • the latter in fact, is necessary to ensure the operation of the electrospindle.
  • the object of the present invention is to at least partially overcome the drawbacks highlighted above by providing an electrospindle which allows to prevent the risk of water exiting from the joint and flowing along the pulling shaft until reaching the motor.
  • an object of the present invention is to provide an electrospindle which is provided with a sensor that indicates the leakage of water from the joint in the direction of the motor.
  • Another object of the present invention is to provide an electrospindle which allows an adequate safety level for the technician using it.
  • a further object of the present invention is to provide an electrospindle which allows to limit the reasons for motor failure.
  • an object of the present invention is to provide an electrospindle which allows to significantly reduce maintenance costs.
  • Another object of the present invention is to provide an electrospindle which allows to limit machine downtime for maintenance.
  • the electrospindle of the invention comprises at least one motor for moving a tool to which is operatively coupled at least one pulling shaft which is operatively couplable to the tool for transmitting motion from the motor to the tool.
  • the electrospindle further comprises at least one rotating element operatively connected to the pulling shaft. Furthermore, the electrospindle of the invention comprises at least one joint stably coupled to the motor and having at least one through hole capable of being hit in a first side by at least a first end of the rotating element. Moreover, the joint is provided with a fitting for connection to a water supply pipe arranged at a second side of the through hole opposite the first side.
  • the presence of the fitting for connection to a water supply pipe allows the insertion of water into the joint for cooling the electrospindle motor, or for carrying out certain machining.
  • the joint comprises a water sensor interposed between the fitting and the first side of the through hole.
  • the presence of the water sensor allows to detect the passage of water from the through hole in the direction of the motor.
  • the above allows to stop the motor before the water reaches it, damaging it.
  • the presence of the water sensor allows to ensure an adequate safety level for the technician employed in the use of the electrospindle of the invention.
  • FIG. 1 depicts an electrospindle according to the invention in a partially sectioned side view
  • FIGS. 2 to 4 depict details of the electrospindle of FIG. 1
  • It comprises a motor 2 for moving a tool to which is operatively coupled a pulling shaft 3 which is operatively couplable to the tool so as to transmit motion from the motor 2 thereto.
  • the electrospindle 1 further comprises at least one rotating element 4 operatively connected to the pulling shaft 3.
  • the rotating element 4 comprises a signalling cam 4bis.
  • the pulling shaft 3 assumes an extracted position to release the tool and a retracted position to hold the tool in position.
  • the presence of the signalling cam 4bis allows to detect the position of the pulling shaft 3 so as to ensure the safe use of the electrospindle
  • the rotating element comprises a rotating shaft or, even more simply, consists of the free end of the pulling shaft made in a single body with the shaft itself.
  • the electrospindle 1 of the invention also comprises a joint 5 stably coupled to the motor 2 and having, as shown in fig. 3, a through hole 7 capable of being hit in a first side 8 by a first end 9 of the signalling cam 4bis. Moreover, the joint 5 is provided with a fitting 10 for connection to a water supply pipe arranged at a second side 11 of the through hole 7 opposite the first side 8.
  • the presence of the fitting 10 for connection to a water supply pipe allows the insertion of water into the joint 5 for cooling the motor 2 of the electrospindle 1, or for carrying out certain machining.
  • the joint 5 comprises a sealing group 12 interposed between the fitting 10 and the through hole 7 and arranged circumferentially to the first end 9 of the signalling cam 4bis.
  • the presence of the sealing group 12 is due to the need to avoid the risk of water passage from the through hole 7 towards the motor 2. In fact, otherwise the motor 2 risks failure due to the contact with water.
  • the sealing group 12 comprises, as can also be seen in the detail in fig. 4, a first annular gasket 13 arranged in contact with the first end 9 of the signalling cam 4bis.
  • the first annular gasket 13 appears as a circular body arranged around the signalling cam 4bis.
  • such a form should not be considered limiting for different embodiments of the invention according to which the first annular gasket has any different geometric shape as long as it is sealed on the cam.
  • the sealing group 12 further comprises a second annular seal 14 also arranged in contact with the first end 9 of the signaling cam 4bis and spaced from the first annular gasket 13.
  • the existence of a space between the first annular gasket 13 and the second annular gasket 14 allows to make a tank where lubricants for the lubrication of the first annular gasket 13 if not also of the second annular gasket 14 can be maintained.
  • lubricants for the lubrication of the first annular gasket 13 if not also of the second annular gasket 14 can be maintained.
  • such an aspect of the invention should not be considered limiting for different embodiments of the invention.
  • instead of lubricants only air or other could be present in the tank.
  • the foregoing allows to avoid the early drying of the sealing group 12, ensuring the seal to the passage of water for a longer time.
  • the sealing group comprises only one or more than two annular gaskets.
  • the joint 5 comprises a water sensor (15) interposed between the fitting 10 and the first side 8 of the through hole 7, and in particular between the sealing group 12 and the first side 8 of the through hole 7.
  • the presence of the water sensor 15 allows to detect the passage of water from the through hole 7 in the direction of the motor 2.
  • the above allows to signal the passage of water before it reaches the motor 2, allowing it to stop in an emergency.
  • the foregoing allows to significantly reduce the occasions in which so-called machine downtime is necessary.
  • the presence of the water sensor 15 allows to ensure a higher safety level for the technician employed in the use of the electrospindle 1 with respect to the electrospindles of the prior art.
  • the annular body 16 is separate with respect to the signalling cam 4bis so as to ensure the mutual electrical insulation thereof. Accordingly, advantageously, maintaining a distance between the annular body
  • the signaling cam 4bis allows to detect the possible passage of water along the signaling cam 4bis in the direction of the motor 2. In fact, it is sufficient to detect the passage of electric current between the signalling cam 4bis and the annular body 16 to deduce that there is water therebetween making the electrical bridge.
  • the senor 15 comprises a container 17 for the annular body 16.
  • the presence of the container 17 allows to retain the annular body 16 in the correct position.
  • the container 17 is also shaped to make a stable coupling with the joint 5 in the through hole 7.
  • the container 17 comprises electrically insulating material arranged so as to ensure the electrical insulation between the annular body 16 and the joint 5.
  • the senor 15 allows the passage of water to be electrically detected.
  • a detection can be used in various manners, for example by means of light signalling.
  • the electrospindle 1 comprises a relay, not depicted here, having a movable contact and a drive circuit.
  • the movable contact is interposed between the electric power supply of the electrospindle 1 and the electrospindle 1 itself.
  • the drive circuit is electrically interposed between the electric power supply and the water sensor 15.
  • the drive circuit is an open circuit because there is no electrical contact between the annular body 16 and the signaling cam 4bis, which, as is known, is electrically connected to ground.
  • the presence of a relay allows to automatically turn off the electrospindle 1 in the event of detection of water passage by the sensor 15.
  • the automatic turning off of the electrospindle 1 allows to avoid the risk of failure of the motor 2 in the event of contact with water.
  • the presence of the relay which allows the automatic turning off of the electrospindle 1 once again increases the safety level for the technician employed in the use thereof.
  • the electrospindle of the invention allows to prevent the risk that water exits from the joint and runs along the pulling shaft until it reaches the motor.
  • it is provided with a sensor which detects the water leakage from the joint in the direction of the motor.
  • electrospindle of the invention allows an adequate safety level for the technician employed in its use. Furthermore, it allows to avoid motor failure.
  • the electrospindle of the invention allows to significantly reduce the maintenance costs of the electrospindle.
  • the electrospindle of the invention allows to limit the reasons for machine downtime.
  • the invention might be subject to many changes and variants, which are all included in the appended claims. Moreover, all the details may furthermore be replaced by other technically equivalent elements, and the materials may be different depending on the needs, without departing from the protection scope of the invention defined by the appended claims.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

Électro-broche comprenant un moteur (2) pour le déplacement d'un outil, un arbre de traction (3) pouvant être accouplé de manière fonctionnelle à l'outil et accouplé de manière fonctionnelle au moteur (2) pour la transmission de mouvement du moteur (2) à l'outil, un élément rotatif (4) relié de manière fonctionnelle à l'arbre de traction (3) et un joint (5) accouplé de façon stable au moteur (2) et comportant un trou traversant (7) pouvant être heurté dans un premier côté (8) par une première extrémité (9) de l'élément rotatif (4). Le joint (5) est pourvu d'un raccord (10) destiné à être relié à un tuyau d'alimentation en eau dans l'électro-broche (1) disposé au niveau d'un second côté (11) du trou traversant (7) opposé au premier côté (8). Entre le raccord (10) et le premier côté (8) du trou traversant (7) un capteur d'eau (15) est interposé de façon à détecter le passage de l'eau depuis le trou traversant (7) dans la direction du moteur (2).
PCT/IB2022/056486 2021-07-29 2022-07-14 Électro-broche WO2023007295A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22747773.4A EP4323147A1 (fr) 2021-07-29 2022-07-14 Électro-broche

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT202100020354 2021-07-29
IT102021000020354 2021-07-29

Publications (1)

Publication Number Publication Date
WO2023007295A1 true WO2023007295A1 (fr) 2023-02-02

Family

ID=78649574

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2022/056486 WO2023007295A1 (fr) 2021-07-29 2022-07-14 Électro-broche

Country Status (2)

Country Link
EP (1) EP4323147A1 (fr)
WO (1) WO2023007295A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008011554A1 (fr) * 2006-07-21 2008-01-24 Deublin Company Système de détection de fuites pour raccord tournant
WO2020174272A1 (fr) * 2019-02-27 2020-09-03 Saccardo Elettromeccanica S.R.L. Électrobroche comprenant un capteur de proximité pour son arbre de traction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008011554A1 (fr) * 2006-07-21 2008-01-24 Deublin Company Système de détection de fuites pour raccord tournant
WO2020174272A1 (fr) * 2019-02-27 2020-09-03 Saccardo Elettromeccanica S.R.L. Électrobroche comprenant un capteur de proximité pour son arbre de traction

Also Published As

Publication number Publication date
EP4323147A1 (fr) 2024-02-21

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